backbone Hear it!

backbone definition

back·bone (-bōn′)

noun

  1. the column of bones along the center of the back of vertebrate animals, including humans, made up of separate bones connected by the spinal cord, ligaments, and disk-shaped cartilage; spine
  2. main support; firmest part
  3. a main ridge or range of mountains
  4. willpower, courage, determination, etc.
  5. back ()

Etymology: ME bakbon: see back & bone

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